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Patterns
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Two Pointers
Two Pointers
Master these 22 problems to understand the Two Pointers pattern.
Start Here
🔒 125. Valid Palindrome
Locked
🔒 88. Merge Sorted Array
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🔒 26. Remove Duplicates from Sorted Array
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🔒 283. Move Zeroes
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🔒 977. Squares of a Sorted Array
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🔒 344. Reverse String
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Core Interview Set
🔒 167. Two Sum II – Input Array Is Sorted
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🔒 15. 3Sum
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🔒 11. Container With Most Water
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🔒 75. Sort Colors
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🔒 680. Valid Palindrome II
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Sliding / Two-Pointer Crossover
🔒 3. Longest Substring Without Repeating Characters
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🔒 567. Permutation in String
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🔒 209. Minimum Size Subarray Sum
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🔒 424. Longest Repeating Character Replacement
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🔒 992. Subarrays with K Different Integers
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Advanced Must-Do
🔒 42. Trapping Rain Water
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🔒 18. 4Sum
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🔒 881. Boats to Save People
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🔒 763. Partition Labels
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🔒 838. Push Dominoes
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🔒 844. Backspace String Compare
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